BS EN 1981-2003 pdf download.Copper and copper alloys – Master alloys.
This BS EN 1981 specifies the compositions of copper-based master alloys intended for the manufacture, deoxidation, or desulturization of cast or wrought alloys, especially those based on copper. supplied in the form of ingots, notched bar, notched slab (waffle plate), granules or broken pieces.
A procedure is included for sampling the master alloys for analysis for verification of conformity to the composition requirements.
A method for the determination of chromium(Lll)-oxide in chromium-copper master alloy is given in annex A.
2 Normative references
This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments).
EN 1655. Capper and copper alloys — Declarations of conformity. EN 10204, Metallic products — Types of inspection documents.
NOTE Informative references to documents used in the preparation of this standard, and cited at the appropriate places in the text, are listed in the bthliography.
3 Terms and definitions
For the purposes of this standard, the following terms and definitions apply:
master alloy
alloy intended to add one or more elements to a melt
3.2
product of one crucible, or one furnace, or one melt
3.3
batch
portion of master alloy taken from one cast
3.4
consignment
4.1.2 Symbol
The material symbol designation is based on the designation system given in ISO 1190-1.
NOTE Although material symbol designations used in this standard might be the same as those In other standards using
the designation system given in Iso 1190-1. the detailed composition requirements are not necessarily the same.
4.1.3 Number
The material number designation is in accordance with the system given in EN 1412
4.2 Product
The product designation provides a standardised pattern of designation from which a rapid and unequivocal description of a product is conveyed in communication. It provides mutual comprehension at the international level with regard to products which meet the requfrements of the relevant European Standard.
The product designation is no substitute for the full content of the standard.
The product designation for products to this standard shall consist of:
— denomination (Copper master alloy):
— number of this European Standard (EN 1981);
— material designation, either symbol, or number (see Table 1);
— material form (the following designations shall be used as appropriate: ING for ingots, NOB for notched bars, NOS for notched slabs. GRN for granules and BPS for broken pieces) (see 6.2).
The derivation of a product designation is shown in the following example.
EXAMPLE Copper master alloy conforming to this standard, in material designated either CuP15(B) or CM218E. in the form of granules, shall be designated as follows:
7.1 General
When required (e.g., if necessary in accordance with specified procedures of a suppliers quality system, or when the purchaser requests inspection documents with test results, or for use in cases of dispute), an inspection lot shall be sampled in accordance with 7.2 or 7.3.
7.2 Cast analysis
For routine control purposes a sample representative of each cast shall be taken from the furnace, or crucible, during the process of casting, and poured into a clean permanent mould of dimensions appropriate to the chosen method of analysis.
7.3 Cases of dispute
In cases of dispute concerning the composition of a master alloy in a consignment, the method of sampling shall be agreed between the disputing parties.
8 Methods of analysis
8.1 Routine cast analysis
The routine methods of analysis carried out on the sample obtained in accordance with 7.2, to verify conformity of
the cast of master alloy to this standard, shall be at the discretion of the supplier.
8.2 Determination of chromlum(lll)-oxide in alloy CuCrlO (CM2O2E)
For alloy CuCrlO (CM2O2E), the method recommended for the determination of Cr2O is given in annex A. NOTE A qualitative assessment can be made by examining a polished microsection, under polarized light, at x 250 magnification.
8.3 Cases of dispute
In cases of dispute concerning the results of analysis of a master alloy, the procedure shall be agreed between the disputing parties.
8.4 Rounding of results
For the purpose of determining conformity to the compositional limits specified in this standard, the result obtained from analysis shall be rounded in accordance with the following procedure, which is based upon the guidance given in annex B of ISO 31-0:1992. It shall be rounded in one step to the same number of figures used to express the specified limit in Table 1.BS EN 1981-2003 pdf download.